Storage battery



' P. M. MARKO.

STORAGE BATTERY.

APPLICATION FILED JULY 5, 1918.

1,368,817, Patented Feb. 15, 1921.0

WITH/58858 INVENTOR ATTORNEY rats STGRAGE BATTERY.

1,36%,Si'l

Specification of Letters Patent.

Patented Feb 15, 192i.

Application filed July 5, 1918. Serial No. 243,428.

To all whom it may concern: 4

lowing'is a full, clear, and exact description.

This invention relates to storage batteries, and has for its generalobject to provide a novel form of jar cover which permits of the level of the electrolyte vto be easily and quickly ascertained without removing the vent or filling plug, this result being obtained by the making ofthe cover of transparent pressed glass of special design and arranging the cover in such a manner that light enters the cell laterally as well as from above, and within the cell are two distinctly colored arrows attached to the terminal posts in such a position as to be seen either from the top or sides of the transparent cover, and these serve as means for determining the proper level ofthe electrolyte.

Another obiectof the invention is to provide a simple, novel and efiective vent plug which is preferably made of soft rubber in one piece and expanding downwardly so as to self-lock in the vent plug opening of the glass cover, which opening expands downwardly, due to the tapered form ofthe molding pin. y

An -additional object is to provide a novel construction whereby an acid-tight joint is obtained between the terminal post and the cover, which prevents the leakage of acid with its attendant evils. v With such and other objects in view, the

nvention comprises various novel features of construction and arrangement of parts whichv will be set forth with particularity in the following description and claims appended; hereto.-

In the accompanying drawings, which illustrate one embodimenttof the invention and wherein similar characters of reference indicate corresponding parts in all the views, Figure 1- is a section of the upper portion of a storage battery;

Fig. 2 is aview of the cover removed;

Fig. 3 is a perspective view of one of the terminal posts and battery plate straps with thetelectrolyte level pointer attached to the P 5 i Fig. 4 is a perspective viewof the vent pliglg for the filling opening of the cover; an

Fig. 5 is a detail view showing a modifie form of cell between the cover and terminal post.

Referring to the drawing, 1 designates the battery box, 2 the jar ofthe cell therein, 3 and 4 the plates, 5 the terminal posts, 6 the cover, 7 the vent plug, 8 a terminal connector, and 9 a coup ing connector.

The cover 6 is made of transparent pressed glass which is selected not only because. it is the best non-insulator, but because it admits light to the cell, whereby the level of the electrolyte can be ascertained at any time by light admitted to the cover. The cover comprises a fiat plate 10 having a surrounding wall 11 which enters the jar 2 and is of such size as to lie in close proximity to the walls of the jar so as to form a surrounding channel 12 which receives a sealing compound 13, part of which latter fills the space at 14: between the jar and the battery box. The cover 6 is supported in such a position that a substantial part of the side walls 11 thereof will project upwardly above the top of the box, so that light can pass through the sidewalls of the coveras well as through the top, and consequently the interior of the cell will' be efiectively hghted. By this means the red arrows or equivalent elements 15 can be readily seen to de ermine the level of the electrolyte, these arrows being fastened to the terminal'posts 5 at the plate straps 16'. i he arrows point inwardly toward each other from t e positions where they can be readily seen through the top plate portion 6 of the glass cover.

The cover 6 is molded with a filling opening 17 which has a slight upward taper resulting from the taper ofthe molding pin, and in this tapered opening is fitted a selflocking rubber vent plug 7. This plug is made of a single piece' of rubber and has a head 'or flange 18 at its top to limit the inward movement of the plug. The body 19 in being inserted in the opening 17 is first compressed, because it enters the smallest end of the opening, and as the plug is inserted it progressively expands until fully any other holding means. The vent bore 20 of the plug is covered by an extremely thin web 21 of rubber which is integral with the .body of the-plug, and this has small vent apertures 22 which are capable of expanding under the pressure of gas generatedin the cell. These holesare small enough to prevent the electrolyte from splashing out, yet thriy will serve for gas venting.

eside the opening 17 the 'cover 6 has terminal post openings 23 each enlarged at the under side of the cover to form. a shoulder 24 against which bears a packing ring 25 which fills the enlarged portion of the terminal post opening. This ring bears against an abutment 26 formed by the upper end of a hard rubber sleeve 27 which surrounds the terminal post and bears on the plate strap 16. The ring is coated with cement before it is applied to the terminal post, so that when the cover is pre'ssedhome the packing ring will -make an excellent acid-tight oint. On the cover 6 is a packing .ring 28 at each opening 23, which lies between the cover and the connector to form an additional means for securing liquidtightness. When the connector and binding post are burned together the rubber rings 25 and 28 become vulcanized, so that the cover and terminal posts are united like one piece and consequently there is positively no 1 chance for the electrolyte to leak out of the method of operation will be readily under-' stood by those skilled in the art to which the invention appertains, and'while I have described the principle of operation, together with the device which I now consider to be the best embodiment thereof, I desire to have it understood that the device shown is-merely illustrative andthat such changes may bemade when desired as fall within the scope of the appended claims.

Having thus described my invention, I claimas new and desire to secure by Letters Patent:

1. The combination of a battery box, a cell jar therein, and a glass cover of relatively thin cross section for the jar arranged in protruding relation to the ledge of the box, whereby light can enter the cell through the sides and top of the cover.

2. The combination of a battery box, a cell jar therein, a glass cover of relatively uniform .cross section and hollow on its under side and supported in the jar in protruding relationto the top edges of the box and cell jar, whereby light can enter the cell through the sides and top of the cover, and means in the jar and observable through the cover for showing the level of the electrolyte.

3. The combinatlon of a battery jar, with a transparent glass. cover having lateral walls extending into the jar, with the top of the cover hollowed out and'disposed outside of the jar edge or top of the jar.

4. The combination of a battery jar, with a pressed glass cover hollow on its under side and having walls sloping outwardly to the walls of thejjar, whereby a channel is formed, the cover being supported in the jar with the upper part of the cover protruding therefrom, whereby light can enter the jar through the sides and top of the coyer, and a sealing compound in the channe a 5. In a battery, the combination of a cover having a terminal .post opening, a plate structure having a terminal post extending through the opening, a packing ring in the .opening and having upper and lower flanges bearing on the upper and lower surfaces of the cover, and a shoulder. on. .the post bearlng against the lower flange of thepacking ring.

6.'The combination of a battery jar, a

. cover therefor having a terminal post opening, a plate structure in the jar and having a terminal post extending through the open ing, said opening having a shoulder, a packmg ring in the opening and bearing against the shoulder, and surrounding the post,- and a sleeve surrounding the post and forming an abutment against which the packing ring PAUL M. MARKO.

bears. 

